a lot has been accomplished since my last post ... here's a few things specific to the single-cut
I cut a proofing heel and rear contour sample to validate the playability and comfort in the upper register. I can play all the way past the 24th fret without my hand bumping into the body - perfect!
I've begun upgrading the CNC to accommodate a 0.022"D end mill for cutting the fret slots parallel to the fretboard contour. Big companies mass producing necks utilize a gang saw; W used to used one of these, not sure if they still do. gang saws are expensive if you're not a machinist with machinist tools, so the alternat is to use a slotting bed on a tablesaw or the CNC with a micro sized end mill. the table saw is less accurate, leaves a flat bottom in the fret slot (big gap in the center) due to the slot being cut before the radius is applied, and slots cut closer to the nut have a larger gap between the bottom of the fret tang and the slot (all due to geometry)
I've been refining my fab workflows and accompanying hold-down tooling, and am in process of proofing the first couple of necks to verify the workflows and CNC tool paths. I should have the first proofing neck completed in the coming two weeks, after which I'll move forward with a couple production units
here's a couple 1-piece proofing blanks on the CNC table. all production necks will be 3+ piece construction, but for validating the tool paths and workflows these 1-piece blanks are just fine. FWIW I get a pair of blanks out of a 2" thick master blank
in it's first CNC step, the back side of the neck is machined to a tight tolerance
then flipped and aligned via pins onto an elevated hold-down block
so it has a consistant reference location for additional machining
its at this above process step where the fretboard gluing face is machined to tolerance, the trussrod and stiffening bar slots are routed, and additional alignment pin holes are drilled
more to come ...
all the best,
R